Communications satellite and archimedes’ screw: what they have in common

1. Step 1. Communications satellite — has part — Solar panel. Power comes from solar panels.
2. Step 2. Solar panel — is part of — Electronic calculator. Many run on a solar cell.
3. Step 3. Electronic calculator — evolved from — Arithmometer. Electronics replaced mechanics.
4. Step 4. Arithmometer — has part — Crank. The handle for adding and subtracting.
5. Step 5. Crank — is part of — Archimedes’ screw. A handle or rotary drive.

Open Evothings